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Applying changes without restarting Minecraft
Restarting Minecraft can take a hefty amount of time. Thankfully, there are tools that allow you to apply some changes while the game is running.
Reload changed classes
In Eclipse or Intellij IDEA, run Minecraft in debug mode. To apply changes in code, click the “build” button in Intellij IDEA or save in Eclipse. Note: this only allows you to change method bodies. If you do any other kind of change, You will have to restart. However, if you use DCEVM, you will be able to do most changes, including adding and removing methods and classes.
After you make changes to assets such as textures and block/item models, you can rebuild the project and press
F3 + T to apply changes without restarting Minecraft. More specifically, this is how to reload anything the mod provides as a resource pack.
You can apply any changes made in the
data/ directory such as recipes, loot tables and tags by rebuilding the project and then using the in-game command
/reload. More specifically, this reloads anything the mod provides as a data pack.